exam Maths Puzzle Numerical Ability

Calcalate the value for z which

2log3(Y)-log3(y+4)= 2

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exam Other Question

I need help with simplifying:
3/x+1 + 3
/ divided by 3x/x-1 -3. one watering system needs about 3 times as long to complete a job as another watering system.when both systems operate at the same time,the job can be completed in 9 mins.how long does it take each systemto do the job alone?